Ballpoint pen



FIG. 1 is a Front Elevation View of a ballpoint pen of the present invention;

FIG. 2 is a Rear Elevation View thereof;

FIG. 3 is a Left Side View thereof;

FIG. 4 is a Right side View thereof;

FIG. 5 is a Top Plan View thereof; and,

FIG. 6 is a Bottom Plan View thereof. 

The ornamental design for a ballpoint pen, as shown and described. 